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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]      
Earnings for basic computations $ 600,740 $ 269,656 $ 463,626
Earnings for diluted computations $ 600,750 $ 269,657 $ 463,635
Weighted-average common stock shares outstanding, basic (in shares) 130,366,501 132,161,646 134,134,034
Dilutive stock options and restricted stock (in shares) 449,402 554,790 716,774
Weighted-average common stock shares outstanding, diluted (in shares) 130,815,903 132,716,436 134,850,808
Earnings per share of common share:      
Basic (in dollars per share) $ 4.61 $ 2.04 $ 3.46
Diluted (in dollars per share) $ 4.59 $ 2.03 $ 3.44
Cash dividends paid $ 253,413 $ 235,726 $ 209,057
Restricted Stock and Other Awards      
Earnings per share of common share:      
Unvested shares participating in the payment of the company's dividends declared (in shares) 1,100,000 1,100,000 900,000
Cash dividends paid $ 2,100 $ 1,800 $ 1,400
Undistributed earnings (loss) allocated to participating securities, basic 2,900 300 1,700
Undistributed earnings (loss) allocated to participating securities, diluted $ 2,900 $ 300 $ 1,700